Home OpenELAB Arduino-Compatible Board UNO R3 with ATmega328P & CH340G
Uno R3 Compatible Arduino Uno R3 - OpenELAB
Uno R3 Compatible Arduino Uno R3 - OpenELAB
Uno R3 Compatible Arduino Uno R3 - OpenELAB
Uno R3 Compatible Arduino Uno R3 - OpenELAB
Uno R3 Compatible Arduino Uno R3 - OpenELAB
Uno R3 Compatible Arduino Uno R3 - OpenELAB

OpenELAB Arduino-Compatible Board UNO R3 with ATmega328P & CH340G

SKU: TB-UNOR3
Sale price 3,35 €
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Uno R3 Compatible Arduino Uno R3 - OpenELAB

OpenELAB Arduino-Compatible Board UNO R3 with ATmega328P & CH340G

3,35 €

Start Building with an UNO R3-Compatible Board

The OpenELAB UNO R3-compatible development board combines an ATmega328P microcontroller with CH340G USB-to-serial communication. Program it through the Arduino IDE to read sensors, control LEDs, respond to buttons and prototype small automation projects.

This is a third-party Arduino-compatible board, not an Arduino-manufactured product. It follows the familiar UNO R3 programming model and header layout, but its USB interface and some board components differ from the original UNO.

Key Features

  • ATmega328P at 16MHz: a well-documented 8-bit AVR platform for learning embedded programming and building compact control applications.
  • 14 digital I/O and 6 analog inputs: connect buttons, sensors and low-current signal interfaces, with six digital pins supporting PWM.
  • CH340G USB-to-serial interface: upload sketches and view serial messages through the square USB Type-B connector.
  • UART, I2C and SPI: communicate with compatible sensor, display and peripheral modules.
  • Reset button and ICSP support: restart a sketch or use a separate AVR programmer for advanced programming and bootloader work.

Technical Specifications

Board / SKU UNO R3-compatible / TB-UNOR3
Microcontroller ATmega328P, 8-bit AVR
Clock 16MHz main processor clock
USB bridge CH340G USB-to-serial
Logic voltage 5V
Flash 32KB total; bootloader occupies part of this space
SRAM / EEPROM 2KB SRAM / 1KB EEPROM
Digital pins D0-D13; 14 digital input/output pins
PWM pins D3, D5, D6, D9, D10, D11
Analog inputs A0-A5; 6 channels with 10-bit ADC resolution
UART D0 RX and D1 TX; shared with USB serial programming
I2C A4 SDA and A5 SCL
SPI D10 SS, D11 MOSI/COPI, D12 MISO/CIPO, D13 SCK; also available through the MCU ICSP header
USB connection USB Type-B, for 5V power and serial data
Power headers 5V, 3.3V, GND and external-input connections; observe their different roles
Wireless No onboard Wi-Fi or Bluetooth

Power and Electrical Limits

USB power is the simplest starting point. A USB connection provides nominal 5V through the board's USB power path. The supplied image describes external 5-9V power without identifying the connection point, while the previous listing specifies 7-12V at the barrel input. Confirm the supplied PCB's regulator, jack polarity and input rating before using an external adapter; do not treat the USB port, VIN and 5V pin as interchangeable inputs.

The 5V header is on the regulated power rail, not a high-voltage input. Feeding it directly can bypass input protection or regulation. Avoid simultaneous external and USB power unless the board's power-selection circuit has been checked.

GPIO pins are signal outputs, not power supplies. Use 20mA per pin as the UNO reference design ceiling, not a target for every pin at once; MCU port and total-current limits also apply. The ATmega328P's 40mA absolute maximum is not a normal operating rating. Use resistors for LEDs and suitable driver circuits for motors, relays and other high-current loads.

No 5V or 3.3V peripheral-current guarantee is made for this clone's regulator. Available current depends on the fitted components, supply, voltage drop and heat. Use an appropriate separate supply for substantial loads and share ground where required. Protect 3.3V-only devices from this board's 5V logic with suitable level shifting.

Setup and Compatibility

  1. Install the Arduino IDE and Arduino AVR Boards support.
  2. Connect the board using a data-capable USB-A to USB-B cable.
  3. If no serial port appears, check the cable and install the appropriate WCH CH340/CH341 serial driver for your operating system.
  4. Select Arduino Uno and the matching serial port, then upload a basic example such as Blink.

Most sketches targeting the ATmega328P-based UNO can be used within its memory and pin limits. Check each shield's physical fit, pin assignments, logic voltage, power demand and library requirements. Universal compatibility with every shield or library is not guaranteed. The CH340G is a serial bridge; workflows that rely on reprogramming the original UNO's ATmega16U2 as a USB keyboard or mouse do not directly apply.

Package Contents

  • 1 x UNO R3-compatible ATmega328P / CH340G board.
  • 1 x USB-A to USB-B cable, as listed for this product; cable length should be confirmed if important.

Sensors, breadboard, shields and external power adapter are not listed as included. A compatible board alone is not a complete sensor or robotics kit.

Documentation and Drivers

Frequently Asked Questions

Is this an original Arduino UNO?

No. It is an OpenELAB-listed compatible board using an ATmega328P and CH340G. Arduino is referenced for software and ecosystem compatibility.

Does it run at 12MHz or 16MHz?

The main ATmega328P runs at 16MHz. A 12MHz crystal associated with CH340G USB circuitry is not the main processor clock.

Why does my computer not detect the board?

Try a known data cable and another USB port, then check whether the WCH serial driver is available for your system. Select the new serial port in the IDE. Driver installation is not guaranteed to be automatic on every operating system.

Are the analog pins true analog outputs?

No. A0-A5 measure analog voltages using the ADC. The six PWM-capable digital pins generate pulses, not a true DAC voltage. Add suitable external circuitry if your project needs a smooth analog output.

Can I connect a motor directly to a pin?

No. Use a motor driver and a suitable power source. GPIO controls the driver; it should not supply the motor's operating or startup current.

Can it use UNO R4 or ESP32 programs unchanged?

Not generally. Those platforms use different processors, peripherals and memory resources. Choose examples and libraries that support the ATmega328P-based UNO.

Why can devices on D0 and D1 interfere with uploads?

These pins are shared with the USB serial connection. Disconnect peripherals that drive RX or TX while uploading, then reconnect them after programming when appropriate.

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Important Notice for Non-EU Countries:
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6. VAT

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Customer Reviews

Based on 6 reviews
83%
(5)
17%
(1)
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L
Leo Scott
Works exactly as expected

I bought this for a controller project and the setup was straightforward after checking the examples. It feels well suited to makers who need a compact dev board.

We appreciate the detailed note. The Arduino UNO R3 Compatible Board – ATmega328P & CH340G | 14 I/O Pins is a practical option for makers, and we are happy it matched your setup.

G
Grace Walker
Very practical product

I used it as the base of a small embedded build and it did the job well. It is a good fit for prototyping before moving to a custom board.

Thanks for sharing your experience with the Arduino UNO R3 Compatible Board – ATmega328P & CH340G | 14 I/O Pins. Feedback like this helps other customers choose the right product for similar builds.

L
Lucas Patel
Good value for the build

The board performed reliably in repeated tests and matched the listing. It is a useful option for WiFi, Bluetooth or microcontroller development.

Thanks for the review. Practical feedback on the Arduino UNO R3 Compatible Board – ATmega328P & CH340G | 14 I/O Pins is useful for customers comparing similar hardware.

B
Ben Scott
Good value for the build

I used this board in a development prototype and it was easy to bring up. It is a practical choice for firmware testing, embedded control and small IoT projects.

Thank you for choosing OpenELAB. We are glad this product supported your use case.

D
Daniel Bailey
Reliable once configured

This board worked well for a quick proof of concept. The layout is usable, and it saved time compared with building around a bare chip or module from scratch.

Thank you for reviewing the Arduino UNO R3 Compatible Board – ATmega328P & CH340G | 14 I/O Pins. We are glad it worked well for your project.